I have 4 different "Card List", "Card Magazine" , "Title" and "Grid" and view holders for each one to relate check 
CodePudding user response：
since long time I was looking for a soultion and i found it and added it to my old project, i was use shared prefernces but in your case i mean data store it will work normally
- you need to create two arrays for each orintation
<?xml version="1.0" encoding="utf-8"?>
<resources>
<array name="recyclerViewPortraitList">
<item>Card List</item>
<item>Card Magazine</item>
<item>Title</item>
</array>
<array name="recyclerViewLandscapeList">
<item>Grid with 3 Span</item>
<item>Grid with 4 Span</item>
</array>
</resources>
- in your data store will be like the following
private object PreferencesKeys {
var RECYCLER_VIEW_PORTRAIT_LAYOUT_KEY = stringPreferencesKey("recyclerViewPortraitLayout")
var RECYCLER_VIEW_LANDSCAPE_LAYOUT_KEY = stringPreferencesKey("recyclerViewLandscapeLayout")
}
suspend fun saveRecyclerViewPortraitLayout(
recyclerViewLayout: String,
) {
datastore.edit { preferences ->
preferences[PreferencesKeys.RECYCLER_VIEW_PORTRAIT_LAYOUT_KEY] = recyclerViewLayout
}
}
suspend fun saveRecyclerViewLandscapeLayout(recyclerViewLayout: String) {
datastore.edit { preferences ->
preferences[PreferencesKeys.RECYCLER_VIEW_LANDSCAPE_LAYOUT_KEY] = recyclerViewLayout
}
}
val readRecyclerViewPortraitLayout:
Flow<String> = datastore.data.catch { ex ->
if (ex is IOException) {
ex.message?.let { Log.e(TAG, it) }
emit(emptyPreferences())
} else {
throw ex
}
}.map { preferences ->
val recyclerViewLayout: String =
preferences[PreferencesKeys.RECYCLER_VIEW_PORTRAIT_LAYOUT_KEY] ?: "cardLayout"
recyclerViewLayout
}
val readRecyclerViewLandscpaeLayout:
Flow<String> = datastore.data.catch { ex ->
if (ex is IOException) {
ex.message?.let { Log.e(TAG, it) }
emit(emptyPreferences())
} else {
throw ex
}
}.map { preferences ->
val recyclerViewLayout: String =
preferences[PreferencesKeys.RECYCLER_VIEW_LANDSCAPE_LAYOUT_KEY] ?: "gridWith3Span"
recyclerViewLayout
}
- in the viewModel
val readRecyclerViewPortraitLayout =
dataStoreRepository.readRecyclerViewPortraitLayout.asLiveData()
val readRecyclerViewLandscapeLayout =
dataStoreRepository.readRecyclerViewLandscpaeLayout.asLiveData()
fun saveRecyclerViewPortraitLayout(layout: String) {
viewModelScope.launch {
dataStoreRepository.saveRecyclerViewPortraitLayout(layout)
}
}
fun saveRecyclerViewLandscapeLayout(layout: String) {
viewModelScope.launch {
dataStoreRepository.saveRecyclerViewLandscapeLayout(layout)
}
}
- in adapter change constants
companion object {
private const val CARD = 0
private const val CARD_MAGAZINE = 1
private const val TITLE = 2
private const val GRID_WITH_3_SPAN = 3
private const val GRID_WITH_4_SPAN = 4
}
5.and finally in the fragment or activity you can use it like the following
private fun setUpRecyclerViewLayout() {
if (requireActivity().resources.configuration.orientation == Configuration.ORIENTATION_PORTRAIT) {
postViewModel.readRecyclerViewPortraitLayout.observe(viewLifecycleOwner) { layout ->
recyclerViewLayout = layout
when (layout) {
"cardLayout" -> {
adapter.viewType = 0
binding.apply {
homeRecyclerView.layoutManager = linearLayoutManager
homeRecyclerView.adapter = adapter
homeRecyclerView.setHasFixedSize(true)
}
}
"cardMagazineLayout" -> {
binding.homeRecyclerView.layoutManager = linearLayoutManager
adapter.viewType = 1
binding.homeRecyclerView.adapter = adapter
}
"titleLayout" -> {
binding.homeRecyclerView.layoutManager = titleLayoutManager
adapter.viewType = 2
binding.homeRecyclerView.adapter = adapter
}
}
}
} else {
postViewModel.readRecyclerViewLandscapeLayout.observe(viewLifecycleOwner) { layout ->
recyclerViewLayout = layout
when (layout) {
"gridWith3Span" -> {
binding.homeRecyclerView.layoutManager = gridWith3SpanLayoutManager
adapter.viewType = 3
binding.homeRecyclerView.adapter = adapter
}
"gridWith4Span" -> {
binding.homeRecyclerView.layoutManager = gridWith4SpanLayoutManager
adapter.viewType = 4
binding.homeRecyclerView.adapter = adapter
}
}
}
}
}
private fun changeAndSaveLayout() {
val builder = AlertDialog.Builder(requireContext())
builder.setTitle(getString(R.string.choose_layout))
// SharedPreferences.Editor editor = sharedPreferences.edit();
if (resources.configuration.orientation == Configuration.ORIENTATION_PORTRAIT) {
builder.setItems(
resources.getStringArray(R.array.recyclerViewPortraitList)
) { _: DialogInterface?, index: Int ->
try {
when (index) {
0 -> {
adapter.viewType = 0
binding.homeRecyclerView.layoutManager = linearLayoutManager
binding.homeRecyclerView.adapter = adapter
postViewModel.saveRecyclerViewPortraitLayout("cardLayout")
}
1 -> {
adapter.viewType = 1
binding.homeRecyclerView.layoutManager = linearLayoutManager
binding.homeRecyclerView.adapter = adapter
postViewModel.saveRecyclerViewPortraitLayout("cardMagazineLayout")
}
2 -> {
adapter.viewType = 2
binding.homeRecyclerView.layoutManager = titleLayoutManager
binding.homeRecyclerView.adapter = adapter
postViewModel.saveRecyclerViewPortraitLayout("titleLayout")
}
else -> {
throw Exception("Unknown layout")
}
}
} catch (e: Exception) {
Log.e(TAG, "changeAndSaveLayout: " e.message)
Log.e(TAG, "changeAndSaveLayout: " e.cause)
}
}
} else {
builder.setItems(
resources.getStringArray(R.array.recyclerViewLandscapeList)
) { _: DialogInterface?, index: Int ->
try {
when (index) {
0 -> {
adapter.viewType = 3
binding.homeRecyclerView.layoutManager = gridWith3SpanLayoutManager
binding.homeRecyclerView.adapter = adapter
postViewModel.saveRecyclerViewLandscapeLayout("gridWith3Span")
}
1 -> {
adapter.viewType = 4
binding.homeRecyclerView.layoutManager = gridWith4SpanLayoutManager
binding.homeRecyclerView.adapter = adapter
postViewModel.saveRecyclerViewLandscapeLayout("gridWith4Span")
}
else -> {
throw Exception("Unknown layout")
}
}
} catch (e: Exception) {
Log.e(TAG, "changeAndSaveLayout: " e.message)
Log.e(TAG, "changeAndSaveLayout: " e.cause)
}
}
}
val alertDialog = builder.create()
alertDialog.show()
}
if you setting configuration changes in manifest like that android:configChanges="orientation|screenSize"you will need to call the setUpRecyclerViewLayout() from onConfigurationChanged
override fun onConfigurationChanged(newConfig: Configuration) {
super.onConfigurationChanged(newConfig)
setUpRecyclerViewLayout()
}